pt_util: gcc warning fix

it's claimed these are not initialized before use.
squelch compiler errors. has to be in parent as otherwise
we will zero them in our loop where we potentially want the
parent group id, which is not on "this" line as we add members.

Reviewed-on: http://gerrit.openafs.org/9840
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 13a3ba7ba2d660a08925a3ccd05d74eedcf8c5cd)

Change-Id: I71b968a8ef0751f6e80633e8051fdfb4a17cfd8d
Reviewed-on: http://gerrit.openafs.org/10738
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>